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Calvin Borel stands poised to become the first jockey to win the Triple Crown since Steve “The Kid” Cauthen rode Affirmed in 1978. Today, we find out which horse he’ll ride in the June 6 Belmont Stakes: Kentucky Derby winner Mine That Bird or the Preakness-winning super filly, Rachel Alexandra.

Both horses have workouts scheduled this morning at Churchill Downs. After Rachel Alexandra’s work, owner Jess Jackson plans to announce whether she will run in the mile-and-a-half “Test of the Champion.”

If she doesn’t, and the prevailing sentiment says she won’t, then Borel will regain the mount on Mine That Bird, who will be a solid favorite in the Belmont if the filly does not run.

Borel, who worked Mine That Bird before the Preakness even though he dumped the Derby winner to ride Rachel Alexandra, will be back in the irons for today’s drill.

“I am definitely looking forward to (the Belmont),” said Mine That Bird’s trainer, Chip Woolley Jr. “He is starting to bloom already again. He is going to stretch his legs in the morning, working an easy three-eighths.”